S. SOLEYMANI - Expert of Dam Constructing Group, Toossab Consulting Engineers Co., Iran
M. DALIRI - Expert of Dam Constructing Group, Toossab Consulting Engineers Co., Iran
A. ADIB - Expert of Technical Office in Khorasan Razavi R.W.O, Iran Ministry of Power
H. BAHRAMI - Expert of Technical Office in Khorasan Razavi R.W.O, Iran Ministry of Power

The Mirabad pumped-storage project, now under feasibility study stage and predicted as a lower CFR dam and a upper cut & cover dam, is located in a region of high seismicity. A seismic hazard analysis was performed to determine the design ground motion parameters for the project The ground motion parameters for the MDL, DBL and CL were obtained from a PSHA whereas the MCL ground motion was derived from a DSHA. Among the many faults occurring within the area considered for the analysis, there are four major faults (i.e. Binalud, Neyshabur, North Neyshabur and Fariman), all with a seismic potential of M≥6.9 and a rupture length exceeding 0.5 km, regarded as the most critical ones for the Mirabad dam site. The Binalud fault, a WNW-ESE-striking thrust fault is the one closest to the project site with a distance to the seismogenic rupture surface of only 0.5 km. With this fault the medians (50th percentile) of the PGA for the MCL are respectively: 0.72g and 0.57g for the Lower Dam site.

Seismic hazard analysis, Fault, Seismo-tectonics, Design ground motion, Iran